Thyroid test in pregnancy #biochemistrytamil

🦋 THYROID FUNCTION TESTS IN PREGNANCY

Pregnancy-la thyroid hormones-la normal physiological changes nadakkum.
Estrogen increase aagi TBG production increase pannum → Total T3 & T4 increase aagum.

At the same time, hCG weak-ah TSH madhiri act panni first trimester-la TSH decrease pannum.
Free T3 & Free T4 usually normal range-la maintain aagum.

✅ Estrogen ↑ → TBG ↑
✅ TBG ↑ → Total T3/T4 ↑
✅ hCG ↑ → TSH ↓
✅ Free T3/T4 → Mostly normal

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